Tooth preparation solution and method

ABSTRACT

A solution is provided for preparing teeth for bonding. The solution includes a liquid solution containing phosphoric acid and a pumice. The phosphoric acid may be in non-gel form. A method of preparing teeth for the adhesion of a component is also provided, and includes applying to at least one tooth a solution of liquid phosphoric acid and an abrasive such as pumice, removing the solution, and applying an adhesive for placing a component on the teeth.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.11/879,437, filed on Jul. 17, 2007, the disclosure of which isincorporated herein by reference.

BACKGROUND OF THE INVENTION

In the orthodontal and dental arts, it is known that prior to affixingorthodontal and dental components, such as braces and bondings, forexample, it is necessary to prepare the teeth. This often involvescleaning the teeth thoroughly and preparing the teeth for adhesion ofthe components. Poor preparation can lead to premature failure of theadhesion.

The teeth may be cleaned using a prophy cup attached to a dentalhandpiece with prophy paste, then rinsed with water. Thereafter, asolution containing phosphoric acid is applied to each affected toothfor a period of time. Care must be taken in applying the phosphoric acidso as not to leave an excess in contact with the gums and with thesurrounding tissue. The phosphoric acid is then washed away with waterto avoid damage to gums and teeth. These steps provide for an opening ofthe enamel tubules that will facilitate bonding of an orthodontal ordental component.

The preparation of the teeth in such a manner can be mechanicallydemanding of the orthodontist or dentist, particularly in connectionwith a set of braces. The process requires several ingredients andnumerous steps, and can become cumbersome and tedious.

U.S. Pat. No. 4,802,950 to Croll seeks to provide an alternate methodfor preparing teeth for bonding. Brace adhesion is not addressed at allin Croll. Croll teaches a gel etchant containing phosphoric acid, fumedsilica, and silicon carbide particles. Croll states that phosphoric acidetchant, in liquid or gel composition is known. However, Croll dislikesthe liquid form of phosphoric acid because, Croll argues, it ischaracterized by “uncontrolled flow” over the surfaces of the teeth.Croll prefers the gel because, he states, it holds its position on theteeth better. Despite Croll's teaching away from liquid etchants overtwenty years ago, it is believed that currently, dentists andorthodontists prefer using the pumice and then a liquid phosphoric acid.The pumice and the liquid phosphoric acid are more effective and lessexpensive that Croll's method. Further, careful placement of the gel onthe teeth is required so as to avoid the gel from contacting the gumsand other tissue. In addition, because of the nature of gels, therinsing process is more difficult.

Thus, an inexpensive, yet still effective, method and product aredesired to prepare the teeth. Preferably a novel method and productwould be easy to use, reduce the number of steps involved in preparingthe teeth and/or increase the effectiveness of the bonding surfacethrough superior preparation.

SUMMARY OF THE INVENTION

In one embodiment of the present invention, a method of preparing teethfor the adhesion of a component includes, applying to at least one tootha solution of liquid phosphoric acid and an abrasive such as pumice,removing the solution, and applying an adhesive for placing a componenton the at least one tooth.

In another embodiment of the present invention, a method of preparingteeth for the adhesion of a component includes, cleaning the tooth/teethwith a prophy paste, removing the prophy paste, applying a solution ofliquid phosphoric acid and an abrasive such as pumice, removing thesolution, and applying an adhesive for placing a component on the atleast one tooth.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a depiction of a first embodiment of the present invention.

FIG. 2 is a depiction of a second embodiment of the present invention.

DETAILED DESCRIPTION

In an embodiment of the present invention, a solution is provided thatcombines an abrasive agent such as pumice and liquid phosphoric acid.Combining a liquid phosphoric acid solution and the pumice can reducethe number of steps required to prepare teeth for adhesion of variousorthodontal and dental components while providing superior results. Evenwhere the same number of steps are used, the results are better than amethod without the solution.

The liquid phosphoric acid and abrasive solution is produced by adding aliquid phosphoric acid solution to powdered pumice. The pumice may befine, medium or coarse, or among those pumices which break down tobecome more fine as they are used. Any suitable abrasive may be used.

The liquid phosphoric acid solution is generally of between, about, 30%and 40% by weight phosphoric acid. Preferably, the phosphoric acid isbetween, about, 35-37% phosphoric acid by weight. However, othersuitable concentrations can be used, and in fact, other suitable acidsor other suitable liquids can be used in place of the phosphoric acid.

A liquid is defined by Dictionary.com as, “composed of molecules thatmove freely among themselves but do not tend to separate like those ofgases; neither gaseous nor solid; of, pertaining to, or consisting ofliquids; flowing like water.” In contrast, a gel is defined as, “asemirigid colloidal dispersion of a solid with a liquid or gas, asjelly, glue, etc.,” also by Dictionary.com.

Croll preferred a gel substance and taught away from liquids, becauseCroll believed the liquids were uncontrollable. But Croll and othersfailed to find, as has now been found, that the addition of pumice tothe liquid phosphoric acid greatly aids in controlling the flow of theliquid solution. The pumice in the liquid helps assist in keeping theliquid solution on the teeth. Phosphoric acid is corrosive andcolorless; therefore, it can be challenging to use phosphoric acidseparately. The addition of pumice allows the liquid solution to beeasily identified and the practitioner can readily control theapplication and removal of the liquid solution.

Typically, a ratio of 1/3 pumice and 2/3etchant is used. However, manyother ratios are acceptable. For example, 2 parts pumice to 3 partsetchant may also be used.

In one embodiment of the present invention, preparing the teeth foradhesion to orthodontal or dental components using the liquid solutionof the present invention includes the steps as depicted in FIG. 1.

At step 10, the solution of pumice and phosphoric acid is applied. Thesolution may be applied using any suitable instrument, such as a swab orthe like. The solution is then rubbed on the teeth for a short time. Forexample, the solution may be rubbed on the teeth for between, about,10-30 seconds. Preferably, it is rubbed on for about 20 seconds. Then,the solution is left on the teeth for between, about, 30 and 60 seconds.Preferably, the solution is left on the teeth for about 40 seconds. Caremust be taken to avoid long periods of contact so as not to damage theteeth.

The solution is then removed from the teeth, at step 12. Any suitablemethod may be used, including, for example, rinsing the teeth withwater. The surfaces are then dried. Thereafter, orthodontal or dentalcomponent may be affixed in any appropriate manner, as at step 14.

In a second embodiment of the present invention, depicted in FIG. 2. Atstep 20 the teeth are cleaned with prophy paste using a prophy cupattached to a dental handpiece. The prophy paste is then removed by anysuitable method, as at step 22. For example, the teeth may be rinsedwith water. At step 24, the liquid solution of phosphoric acid andpumice is applied, using a swab for example. The liquid solution isrubbed on and left on the teeth for a period of time as statedpreviously. Then, at step 26, the liquid solution is removed in anysuitable manner. For example, the teeth may be rinsed with water.Finally, at step 28, a dental or orthodontal component is applied to theteeth.

Thus, in an embodiment of the present invention, this solution of thepumice and the phosphoric acid overcomes the difficulties Croll findswith the liquid without resort to a gel. The addition of the pumice aidsin controlling the flow of the liquid while still retaining therinsability of the liquid. Further, adding an abrasive to the phosphoricacid improves the cleaning effect of the etchant solution. Liquidphosphoric acid solutions are also very reasonably priced, and whenused, as in an embodiment of the present invention, provide a solutionwhich is readily seen, is easy to use and provides an effective way toprepare the teeth for adhesion to orthodontal and dental components,particularly for the adhesion of brace brackets.

Although reference has been made to preparing teeth, it should be notedthat a single tooth or a few teeth may also be prepared in the manner asdescribed herein.

Although the invention herein has been described with reference toparticular embodiments, it is to be understood that these embodimentsare merely illustrative of the principles and applications of thepresent invention. It is therefore to be understood that numerousmodifications may be made to the illustrative embodiments and that otherarrangements may be devised without departing from the spirit and scopeof the present invention as defined by the appended claims.

1. A solution for preparing teeth for bonding, comprising: a liquidsolution containing phosphoric acid in non-gel form and a pumice.
 2. Thesolution of claim 1, wherein the pumice comprises coarse, medium or fineparticles.
 3. The solution of claim 1, wherein the phosphoric acidcomprises between about 30 and 40% phosphoric acid by weight.
 4. Thesolution of claim 1, wherein the phosphoric acid comprises between about35 and 37% phosphoric acid by weight.
 5. The solution of claim 1,wherein the solution comprises 1/3pumice and 2/3phosphoric acid.